Power supply control circuit and power supply control system

Abstract

The invention is suitable for the technical field of power supply control systems, and provides a power supply control circuit and a power supply control system. The power supply control circuit comprises a control module, a voltage division module, a voltage conversion module, a feedback module, a switch module and a current detection module, the control module is electrically connected with the voltage division module, the voltage conversion module, the feedback module, the switch module and the current detection module, and the voltage conversion module is electrically connected with the feedback module. The switch module is electrically connected with the current detection module. According to the power supply control circuit provided by the embodiment of the invention, whether the first conversion voltage output by the voltage conversion module is the voltage required by the load or not can be judged by detecting the current flowing through the load. If the first conversion voltage is not the voltage required by the load, the first conversion voltage can be adjusted in real time, so that the first conversion voltage is accurately matched with the voltage required by the load. Therefore, the power supply control circuit can adapt to loads with different voltage requirements, and has a wide application range and high flexibility.

Description

Technical Field

[0001] This application belongs to the technical field of power supply control systems, and particularly relates to a power supply control circuit and a power supply control system. Background Art

[0002] Existing circuits for powering and dimming LED (Light Emitting Diode) light strips generally use constant voltage controllers. However, constant voltage controllers have a significant drawback, that is, the load voltage of the LED light strip at the output end must be equal to the voltage at the input end. If the input end is connected to a 24V power supply, then the output end must be connected to a 24V LED light strip; similarly, if the input end is connected to a 12V power supply, the output end must be connected to a 12V LED light strip. This strict voltage matching requirement greatly limits the applicable range of the power supply circuit. Summary of the Invention

[0003] Embodiments of this application provide a power supply control circuit and a power supply control system, which can solve the problem that the applicable range of existing power supply and dimming circuits is limited.

[0004] In a first aspect, embodiments of this application provide a power supply control circuit, including a control module, a voltage dividing module, a voltage conversion module, a feedback module, a switching module, and a current detection module. The control module is electrically connected to the voltage dividing module, the voltage conversion module, the feedback module, the switching module, and the current detection module respectively. The voltage conversion module is electrically connected to the feedback module, and the switching module is electrically connected to the current detection module. Both the voltage conversion module and the switching module are used to be electrically connected to a load;

[0005] The voltage dividing module is used to divide the input voltage and output a first voltage to the control module. The control module is used to output a first control signal to the voltage conversion module according to the first voltage. The voltage conversion module is used to output a first converted voltage to the load and the feedback module according to the first control signal. The feedback module is used to output a feedback voltage signal to the control module according to the first converted voltage. The switching module is used to conduct according to the switching control signal output by the control module. The current detection module is used to detect the current flowing through the load and output a first detection signal to the control module. The control module is further used to output a second control signal to the voltage conversion module according to the first detection signal and the feedback voltage signal, so that the voltage conversion module adjusts the first converted voltage.

[0006] In a possible implementation of the first aspect, the control module includes a control chip, and the control chip is electrically connected to the voltage dividing module, the voltage conversion module, the feedback module, the switch module, and the current detection module respectively.

[0007] In a possible implementation of the first aspect, the control module further includes a logic control unit and a DIP switch. The logic control unit is electrically connected to the first end of the DIP switch and the voltage conversion module respectively. The second end of the DIP switch is grounded, and the control end of the DIP switch is used to receive a DIP control signal.

[0008] In a possible implementation of the first aspect, the voltage dividing module includes a first resistor and a second resistor. The first end of the first resistor is used to receive the input voltage. The second end of the first resistor is electrically connected to the first end of the second resistor and the control module respectively. The second end of the second resistor is grounded.

[0009] In a possible implementation of the first aspect, the voltage conversion module includes a voltage converter, and the voltage converter is electrically connected to the control module and the feedback module respectively.

[0010] In a possible implementation of the first aspect, the feedback module includes a third resistor and a fourth resistor. The first end of the third resistor is electrically connected to the voltage conversion module. The second end of the third resistor is electrically connected to the first end of the fourth resistor and the control module respectively. The second end of the fourth resistor is grounded.

[0011] In a possible implementation of the first aspect, the switch module includes a first switching tube. The gate of the first switching tube is electrically connected to the control module. The drain of the first switching tube is used to be electrically connected to the load. The source of the first switching tube is electrically connected to the current detection module.

[0012] In a possible implementation of the first aspect, the current detection module includes a current detection unit and a fifth resistor. The current detection unit is electrically connected to the first end of the fifth resistor, the second end of the fifth resistor, and the control module respectively. The current detection unit is used to output the first detection signal to the control module according to the voltage at the first end of the fifth resistor and the voltage at the second end of the fifth resistor.

[0013] In a possible implementation of the first aspect, the power supply control circuit further includes a buck module. The buck module is electrically connected to the control module. The buck module is used to step down the input voltage and transmit the stepped-down voltage to the control module.

[0014] Second aspect, an embodiment of the present application provides a power supply control system, including a load and the power supply control circuit described in any one of the first aspects, where the load is electrically connected to a voltage conversion module and a switch module in the power supply control circuit respectively.

[0015] The beneficial effects of the embodiments of the present application compared with the prior art are as follows:

[0016] The power supply control circuit provided by the embodiment of the present application includes a control module, a voltage dividing module, a voltage conversion module, a feedback module, a switch module, and a current detection module. Among them, the control module can output a first control signal to the voltage conversion module according to the first voltage output by the voltage dividing module, so that the voltage conversion module outputs a first converted voltage. At this time, the control module controls the switch module to conduct, so that the load and the current detection module are conducted, thereby ensuring that the current detection module can detect the current flowing through the load and output a first detection signal to the control module. The control module then outputs a second control signal to the voltage conversion module according to the first detection signal and the feedback voltage signal output by the feedback module, so that the voltage conversion module adjusts the first converted voltage, thereby ensuring that the first converted voltage is the voltage required by the load. It can be seen from this that the power supply control circuit provided by the embodiment of the present application can judge whether the first converted voltage output by the voltage conversion module is the voltage required by the load by detecting the current flowing through the load. If the first converted voltage is not the voltage required by the load, the first converted voltage can be adjusted in real time to accurately match the voltage required by the load. Therefore, the power supply control circuit of the present application can adapt to loads with different voltage requirements, has a wide range of applications and high flexibility.

[0017] It can be understood that the beneficial effects of the above second aspect can be referred to the relevant descriptions in the above first aspect, and will not be repeated here. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0019] Figure 1 is a schematic block diagram of a power supply control circuit provided by an embodiment of the present application;

[0020] Figure 2 is a schematic circuit connection diagram of a power supply control circuit provided by an embodiment of the present application;

[0021] Figure 3 is a schematic circuit connection diagram of a power supply control circuit provided by another embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the circuit connection of the power supply control circuit provided by another embodiment of the present application;

[0023] Figure 5 It is a diagram showing the corresponding relationship between the DIP switch and the output load voltage provided by an embodiment of the present application;

[0024] Figure 6 It is a schematic diagram of the circuit connection of the power supply control circuit provided by another embodiment of the present application.

[0025] In the figure, 10 is the power supply control circuit; 101 is the control module; 102 is the voltage dividing module; 103 is the voltage conversion module; 104 is the feedback module; 105 is the switch module; 106 is the current detection module; 107 is the buck module; 20 is the load. Detailed implementation manners

[0026] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0027] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0028] It should also be understood that the term "and / or" as used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] As used in the specification and appended claims of the present application, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0030] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but rather mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0032] Existing circuits for powering and dimming LED (Light Emitting Diode) strip lights generally use a constant voltage controller. However, the constant voltage controller has a significant defect, that is, the load voltage of the LED strip light at its output end must be equal to the voltage at its input end. If the power supply connected to the input end is 24V, then the LED strip light connected to the output end must be 24V; similarly, if the power supply connected to the input end is 12V, the LED strip light connected to the output end must be 12V. This strict voltage matching requirement greatly limits the applicable range of the circuit.

[0033] Based on the above problems, the power supply control circuit provided by the embodiments of this application includes a control module, a voltage dividing module, a voltage conversion module, a feedback module, a switching module, and a current detection module. Among them, the control module can output a first control signal to the voltage conversion module according to the first voltage output by the voltage dividing module, so that the voltage conversion module outputs a first converted voltage. At this time, the control module controls the switching module to conduct, so that the load and the current detection module are conducted, so as to ensure that the current detection module can detect the current flowing through the load and output a first detection signal to the control module. The control module then outputs a second control signal to the voltage conversion module according to the first detection signal and the feedback voltage signal output by the feedback module, so that the voltage conversion module adjusts the first converted voltage, so as to ensure that the first converted voltage is the voltage required by the load. It can be seen from this that the power supply control circuit provided by the embodiments of this application can judge whether the first converted voltage output by the voltage conversion module is the voltage required by the load by detecting the current flowing through the load. If the first converted voltage is not the voltage required by the load, the first converted voltage can be adjusted in real time to accurately match the voltage required by the load. Therefore, the power supply control circuit of this application can adapt to loads with different voltage requirements, and has a wide applicable range and high flexibility.

[0034] In order to illustrate the technical solutions described in this application, the following will be described through specific embodiments.

[0035] Figure 1 The principle block diagram of the power supply control circuit 10 provided by an embodiment of the present application is shown. Refer to Figure 1 As shown, the power supply control circuit 10 includes a control module 101, a voltage division module 102, a voltage conversion module 103, a feedback module 104, a switch module 105, and a current detection module 106. The control module 101 is electrically connected to the voltage division module 102, the voltage conversion module 103, the feedback module 104, the switch module 105, and the current detection module 106 respectively. The voltage conversion module 103 is electrically connected to the feedback module 104. The switch module 105 is electrically connected to the current detection module 106. Both the voltage conversion module 103 and the switch module 105 are used to be electrically connected to the load 20.

[0036] Specifically, the voltage division module 102 is used to divide the input voltage and output a first voltage to the control module 101. The control module 101 can output a first control signal to the voltage conversion module 103 according to the first voltage output by the voltage division module 102, so that the voltage conversion module 103 outputs a first converted voltage. At this time, the control module 101 controls the switch module 105 to conduct, so that the load 20 and the current detection module 106 are conducted, thereby ensuring that the current detection module 106 can detect the current flowing through the load 20 and output a first detection signal to the control module 101. The control module 101 then outputs a second control signal to the voltage conversion module 103 according to the first detection signal and the feedback voltage signal output by the feedback module 104, so that the voltage conversion module 103 adjusts the first converted voltage, thereby ensuring that the first converted voltage is the voltage required by the load 20. It can be seen from this that the power supply control circuit 10 provided by the embodiment of the present application can judge whether the first converted voltage output by the voltage conversion module 103 is the voltage required by the load 20 by detecting the current flowing through the load 20. If the first converted voltage is not the voltage required by the load 20, the first converted voltage can be adjusted in real time to make it accurately match the voltage required by the load 20. Therefore, the power supply control circuit 10 of the present application can adapt to loads 20 with different voltage requirements, and has a wide range of applications and high flexibility.

[0037] It should be noted that the load 20 can be an LED light strip formed by multiple series-connected LED lamp beads. The voltages required for the LED light strip are usually: +12V, +24V, +36V, +48V. The input voltages at the power input end are usually: +12V, +24V, +36V, +48V. The specific principle of the control module 101 controlling the voltage conversion module 103 to adjust the first converted voltage is as follows: The control module 101 is used to obtain the input voltage according to the first voltage. When the input voltage is the first preset voltage (such as +12V), the control module 101 controls the voltage conversion module 103 to be in the first mode (such as the direct-through mode, without voltage conversion), that is, the first converted voltage is +12V. At this time, the control module 101 controls the switch module 105 to conduct, and the current detection module 106 detects the current flowing through the load 20 and outputs a corresponding detection signal to the control module 101. If the control module 101 determines according to the detection signal that no current flows through the load 20, it indicates that the voltage required by the load 20 is not +12V. At this time, the control module 101 controls the voltage conversion module 103 to be in the boost mode and outputs the second preset voltage (such as +24V), that is, the first converted voltage has been raised to +24V. The control module 101 continues to obtain the current flowing through the load 20 through the current detection module 106. If the control module 101 determines according to the detection signal that no current still flows through the load 20, it indicates that the voltage required by the load 20 is not +24V. At this time, the control module 101 controls the voltage conversion module 103 to be in the boost mode and outputs the third preset voltage (such as +36V), that is, the first converted voltage has been raised to +36V. The control module 101 continues to obtain the current flowing through the load 20 through the current detection module 106. If the control module 101 determines that there is current flowing through the load 20, it can indicate that the voltage required by the load 20 is +36V. Otherwise, the control module 101 will continue to control the voltage conversion module 103 to be in the boost mode and output the fourth preset voltage (such as +48V), that is, the first converted voltage is continuously raised to +48V.

[0038] It should be noted that the control module 101 is used to obtain the input voltage according to the first voltage. When the input voltage is the fourth preset voltage (such as +48V), the control module 101 controls the voltage conversion module 103 to be in the buck mode and outputs the first preset voltage (such as +12V), that is, the first converted voltage is +12V. At this time, the control module 101 controls the switch module 105 to conduct, and the current detection module 106 detects the current flowing through the load 20 and outputs a corresponding detection signal to the control module 101. If the control module 101 determines according to the detection signal that no current flows through the load 20, it indicates that the voltage required by the load 20 is not +12V. At this time, the control module 101 controls the voltage conversion module 103 to be in the buck mode and outputs the second preset voltage (such as +24V), that is, the first converted voltage has been stepped down to +24V, and the control module 101 continues to obtain the current flowing through the load 20 through the current detection module 106. If the control module 101 determines according to the detection signal that no current still flows through the load 20, it indicates that the voltage required by the load 20 is not +24V. At this time, the control module 101 controls the voltage conversion module 103 to be in the buck mode and outputs the third preset voltage (such as +36V), that is, the first converted voltage has been stepped down to +36V, and the control module 101 continues to obtain the current flowing through the load 20 through the current detection module 106. If the control module 101 determines that there is current flowing through the load 20, it can indicate that the voltage required by the load 20 is +36V. Otherwise, the control module 101 will continue to control the voltage conversion module 103 to be in the through mode and output the fourth preset voltage (such as +48V), that is, the first converted voltage is +48V. In summary, the control module 101 determines whether there is current flowing through the load 20 through the detection signal output by the current detection module 106, and controls the voltage conversion module 103 to adjust the output first converted voltage, that is, increase the first converted voltage to reach the voltage required by the load 20.

[0039] It should be noted that the power supply control circuit 10 provided in this application can also adjust different output voltages (the first converted voltage) through the control of the control module 101 on the voltage conversion module 103 to achieve the purpose of dimming the LED light strip, and this dimming method is linear dimming to achieve flicker-free dimming.

[0040] In an embodiment of this application, as Figure 2 or Figure 3 or Figure 4 shown, the control module 101 includes a control chip MCU, and the control chip MCU is electrically connected to the voltage division module 102, the voltage conversion module 103, the feedback module 104, the switch module 105, and the current detection module 106 respectively.

[0041] Specifically, the control chip MCU can determine the input voltage based on the first voltage and output a first control signal to the voltage conversion module 103, causing the voltage conversion module 103 to output a first converted voltage. The control chip MCU can also obtain the first converted voltage based on the feedback voltage. At the same time, the control chip MCU can also determine whether there is current flowing through the load 20 according to the first detection signal output by the current detection module 106, and thus output a second control signal to the voltage conversion module 103 to adjust the first converted voltage output by the voltage conversion module 103.

[0042] In an embodiment of the present application, as Figure 3 and Figure 4 shown, the control module 101 further includes a logic control unit and a DIP switch. The logic control unit is electrically connected to the first end of the DIP switch and the voltage conversion module 103 respectively. The second end of the DIP switch is grounded, and the control end of the DIP switch is used to receive a DIP control signal.

[0043] Specifically, as Figure 3 shown, if the input voltage is +48V, the brightness of the load 20 can be judged by the human eye, and thus different combinations of the DIP switch can be configured and operated, that is, a DIP control signal is output to the DIP switch. Then, the logic control unit performs a logic calculation on the switch signal output by the DIP switch and outputs a logic control signal to the voltage conversion module 103, so that the voltage conversion module 103 outputs the voltage required by the load 20. Similarly, as Figure 4 shown, if the input voltage is +12V, the brightness of the load 20 can be judged by the human eye, and thus different combinations of the DIP switch can be configured and operated, and then a logic control signal is output to the voltage conversion module 103 through the logic control unit, so that the voltage conversion module 103 outputs the voltage required by the load 20.

[0044] Exemplarily, the DIP switch includes two DIP switch positions. Different high and low level configurations of the two positions will cause different logic control signals output by the logic control unit, and further cause changes in the first converted voltage output by the voltage conversion module 103 to the load 20. As Figure 5 shown, the DIP switch position 1 is at a low level, and the DIP switch position 2 is at a low level. At this time, the first converted voltage output by the voltage conversion module 103 to the load 20 ( Figure 5The output load voltage shown is +12V; when the dip switch is in position 1 (low level) and position 2 (high level), the first transformed voltage output by the voltage conversion module 103 to the load 20 is +24V; when the dip switch is in position 1 (high level) and position 2 (high level), the first transformed voltage output by the voltage conversion module 103 to the load 20 is +36V; when the dip switch is in position 1 (high level) and position 2 (low level), the first transformed voltage output by the voltage conversion module 103 to the load 20 is +48V.

[0045] It should be noted that the control module 101 may further include a photoresistor or other optoelectronic sensing devices for detecting whether the LED light strip emits light and the light intensity. After detecting that the LED light strip emits light and confirming the light intensity, the optoelectronic sensing device can output a light intensity signal to the control module 101 so that the control module 101 controls the output voltage of the voltage conversion module 103.

[0046] In an embodiment of the present application, as Figure 2 or Figure 3 or Figure 4 shown, the voltage dividing module 102 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is used to receive the input voltage. The second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the control module 101 respectively. The second end of the second resistor R2 is grounded.

[0047] Specifically, the first resistor R1 and the second resistor R2 form the voltage dividing module 102, which is used to divide the input voltage and output a lower first voltage to the control module 101 so that the control module 101 can determine the input voltage by obtaining the first voltage.

[0048] In an embodiment of the present application, the voltage conversion module 103 includes a voltage converter, and the voltage converter is electrically connected to the control module 101 and the feedback module 104 respectively.

[0049] Specifically, the voltage converter includes a buck-boost conversion circuit, which can perform voltage conversion on the input voltage according to the control signal output by the control module 101. The voltage conversion includes boosting, bucking, and neither boosting nor bucking. When the voltage converter boosts the input voltage, the voltage conversion module 103 is in the boost mode at this time; when the voltage converter buckles the input voltage, the voltage conversion module 103 is in the buck mode at this time; when the voltage converter neither boosts nor buckles the input voltage, the voltage conversion module 103 is in the direct-through mode at this time.

[0050] In an embodiment of the present application, as Figure 2 or Figure 3 or Figure 4As shown, the feedback module 104 includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is electrically connected to the voltage conversion module 103. The second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4 and the control module 101 respectively. The second end of the fourth resistor R4 is grounded.

[0051] Specifically, the third resistor R3 and the fourth resistor R4 are used to divide the output voltage (the first conversion voltage) of the voltage conversion module 103 and output a lower feedback voltage to the control module 101, so that the control module 101 can determine the output voltage of the voltage conversion module 103 by obtaining the feedback voltage, that is, determine the voltage provided by the voltage conversion module 103 for the load 20.

[0052] In an embodiment of the present application, as Figure 2 or Figure 3 or Figure 4 As shown, the switch module 105 includes a first switching tube Q1. The gate of the first switching tube Q1 is electrically connected to the control module 101. The drain of the first switching tube Q1 is used to be electrically connected to the load 20. The source of the first switching tube Q1 is electrically connected to the current detection module 106.

[0053] Specifically, the first switching tube Q1, as a switching device, can be turned on according to the switching control signal output by the control module 101, so that the source and drain of the first switching tube Q1 are turned on, that is, the load 20 and the current detection module 106 are turned on, so as to ensure that the current detection module 106 can detect the current flowing through the load 20. In addition, after determining the voltage required by the load 20, the control module 101 adjusts the conduction degree of the first switching tube Q1 by outputting a PWM signal to the gate of the first switching tube Q1, thereby realizing PWM dimming.

[0054] Exemplarily, the designer can select the type of the first switching tube Q1 according to the actual situation, that is, a fully controlled power device such as a metal oxide field effect transistor or an insulated gate bipolar transistor can be used. For example, the first switching tube Q1 can be selected as an NMOS tube.

[0055] It should be noted that, as Figure 6 shown, the first switching tube Q1 can be removed, so that the current detection module 106 is always connected to the load 20, thereby detecting the current flowing through the load 20. At the same time, by adjusting the output voltage of the voltage conversion module 103, the brightness change of the LED lamp in the load 20 can be realized, and flicker-free dimming can be realized.

[0056] In an embodiment of the present application, as Figure 2 or Figure 3 or Figure 4As shown, the current detection module 106 includes a current detection unit and a fifth resistor R5. The current detection unit is electrically connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5, and the control module 101 respectively.

[0057] Specifically, the current detection unit is connected across the fifth resistor R5, can detect the voltage at the first end of the fifth resistor R5 and the voltage at the second end of the fifth resistor R5, perform logical operations and processing on the two, and output a first detection signal to the control module 101. The control module 101 determines whether there is current flowing through the fifth resistor R5 based on the first detection signal output by the current detection module 106, and controls the voltage conversion module 103 to adjust the first conversion voltage it outputs, that is, increase the first conversion voltage, when it is determined that there is no current flowing through the fifth resistor R5, so as to make it reach the voltage required by the load 20.

[0058] In an embodiment of the present application, as Figure 2 or Figure 3 or Figure 4 or Figure 6 shown, the power supply control circuit 10 further includes a buck module 107, and the buck module 107 is electrically connected to the control module 101.

[0059] Specifically, the buck module 107 is used to step down the input voltage and transmit the stepped-down voltage to the control module 101 to ensure a stable power supply for the control module 101.

[0060] It should be noted that the buck module 107 may include a buck chip to achieve stepping down of the input voltage and supply power to the control module 101.

[0061] The present application also discloses a power supply control system, including a load 20 and the above-mentioned power supply control circuit 10. The load 20 is electrically connected to the voltage conversion module 103 and the switch module 105 in the power supply control circuit 10 respectively. The power supply control system adopting the above-mentioned power supply control circuit 10 can adapt to loads with different voltage requirements, and has a wide range of applications and high flexibility.

[0062] Since the processing and functions implemented by the power supply control system in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing power supply control circuit, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments, and no further elaboration will be made here.

[0063] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A power supply control circuit, characterized in that: It includes a control module, a voltage dividing module, a voltage conversion module, a feedback module, a switch module and a current detection module, wherein the control module is electrically connected to the voltage dividing module, the voltage conversion module, the feedback module, the switch module and the current detection module respectively, the voltage conversion module is electrically connected to the feedback module, the switch module is electrically connected to the current detection module, and the voltage conversion module and the switch module are both used to be electrically connected to a load; The voltage divider module is used to divide the input voltage and output a first voltage to the control module. The control module is used to output a first control signal to the voltage conversion module according to the first voltage. The voltage conversion module is used to output a first conversion voltage to the load and the feedback module according to the first control signal. The feedback module is used to output a feedback voltage signal to the control module according to the first conversion voltage. The switch module is used to be turned on according to the switch control signal output by the control module. The current detection module is used to detect the current flowing through the load and output a first detection signal to the control module. The control module is also used to output a second control signal to the voltage conversion module according to the first detection signal and the feedback voltage signal, so that the voltage conversion module adjusts the first conversion voltage.

2. The power supply control circuit according to claim 1, characterized in that: The control module comprises a control chip, and the control chip is electrically connected to the voltage dividing module, the voltage conversion module, the feedback module, the switch module and the current detection module respectively.

3. The power supply control circuit according to claim 2, characterized in that: The control module also includes a logic control unit and a dip switch, the logic control unit is electrically connected to the first end of the dip switch and the voltage conversion module respectively, the second end of the dip switch is grounded, and the control end of the dip switch is used to receive a dip control signal.

4. The power supply control circuit according to claim 1, characterized in that: The voltage divider module includes a first resistor and a second resistor, the first end of the first resistor is used to receive the input voltage, the second end of the first resistor is electrically connected to the first end of the second resistor and the control module respectively, and the second end of the second resistor is grounded.

5. The power supply control circuit according to claim 1, characterized in that: The voltage conversion module includes a voltage converter, and the voltage converter is electrically connected to the control module and the feedback module respectively.

6. The power supply control circuit according to claim 1, characterized in that: The feedback module includes a third resistor and a fourth resistor, the first end of the third resistor is electrically connected to the voltage conversion module, the second end of the third resistor is electrically connected to the first end of the fourth resistor and the control module respectively, and the second end of the fourth resistor is grounded.

7. The power supply control circuit according to claim 1, characterized in that: The switch module includes a first switch tube, a gate of the first switch tube is electrically connected to the control module, a drain of the first switch tube is used to be electrically connected to the load, and a source of the first switch tube is electrically connected to the current detection module.

8. The power supply control circuit according to claim 1, characterized in that: The current detection module includes a current detection unit and a fifth resistor, the current detection unit is electrically connected to the first end of the fifth resistor, the second end of the fifth resistor and the control module, respectively, and the current detection unit is used to output the first detection signal to the control module according to the voltage of the first end of the fifth resistor and the voltage of the second end of the fifth resistor.

9. The power supply control circuit according to any one of claims 1 to 8, characterized in that: The power supply control circuit further includes a step-down module, which is electrically connected to the control module. The step-down module is used to step down the input voltage and transmit the stepped-down voltage to the control module.

10. A power supply control system, characterized in that: It comprises a load and the power supply control circuit according to any one of claims 1 to 9, wherein the load is electrically connected to a voltage conversion module and a switch module in the power supply control circuit respectively.

Images